How to copy animations to a rig with different bones?
Delete the bones from the model you want to duplicate your animated bones to. Then copy and paste the bones from the original armature and move it into the model. Then do the ctrl p and combine the two. After that if you play the animation you will see if it rotates that the rotation is much more major the farther away it is from the original armature not only will you need to delete the rotation but also the position. For it will move exactly in the spot of the original armature. The only thing that would work is scale keyframes. The others would simply not work when copied. The only possible way I believe is if you could re-calculate the x and y position to make it from go to x 30 to + 30 x. If that makes sense.